Subgingival scraping is generally recommended between six months and one year to remove tartar, plaque, etc. from the mouth and maintain healthy oral hygiene. If oral hygiene is poor, such as a large amount of tartar accumulation, daily cleaning is not in place, it is recommended that subgingival scraping can be done once every six months or so, in order to facilitate timely cleaning of tartar, plaque, etc., to avoid the chances of dental caries and periodontal disease. If the oral hygiene situation is better, daily cleaning in place, you can choose to do a subgingival scraping in about a year, because tartar and other less accumulation, coupled with brushing and other oral health can be ensured. In addition, there are some special cases where subgingival scraping may be done more frequently, such as when periodontal disease is treated with subgingival scraping, which may need to be done once a week or so. The purpose is to scrape for the first time as a cleaning treatment, and later to maintain a healthy oral environment and minimize the attachment of tartar and plaque.